"Tue, 21 Apr 1970 07:12:40"

Convert date and time to unixtime.

9529960

Another datetime format string at UTC

YYYYMMDD
19700421

Only TIME
07:12:40

General datetime
1970-04-21 07:12:40Z

For Database
1970-04-21 07:12:40

For HTTP1.1
Tue, 21 Apr 1970 07:12:40 GMT

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